BKDR_PLUGX.DMI
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
TECHNICAL DETAILS
Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This backdoor adds the following folders:
- %User Temp%\hhx
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It drops the following files:
- %User Temp%\2.pdf
- %User Temp%\hhx\hha.dll
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It drops and executes the following files:
- %User Temp%\hhx\hhc.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Credential Manager Command Line Utility
ImagePath = "%User Temp%\hhx\hhc.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CLASSES_ROOT\FAST
HKEY_CURRENT_USER\Software\WinRAR SFX
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Credential Manager Command Line Utility
It adds the following registry entries:
HKEY_CLASSES_ROOT\FAST
CLSID = "{random}"
HKEY_CURRENT_USER\Software\WinRAR SFX
%User Temp% = "%User Temp%"
Other Details
This backdoor connects to the following possibly malicious URL:
- http://www.{BLOCKED}er.flower-show.org:443/update
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CLASSES_ROOT
- FAST
- FAST
- In HKEY_CURRENT_USER\Software
- WinRAR SFX
- WinRAR SFX
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- Credential Manager Command Line Utility
- Credential Manager Command Line Utility
Step 4
Search and delete this folder
- %User Temp%\hhx
Step 5
Search and delete this file
- %User Temp%\2.pdf
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PLUGX.DMI. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Did this description help? Tell us how we did.